<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 警告区 -->
            <el-alert
            show-icon title="注意：只允许为第三级分类设置相关参数"
            type="warning" :closable="false">
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="option">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                 <el-cascader
                v-model="selectedCateKeys"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-col>
            </el-row>
            <!-- tab 页签区 -->
            <el-tabs v-model="activeName" @tab-click="handleClick">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 索引列 -->
                        <!-- 展开列 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 文本输入框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 添加新标签</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 索引列 -->
                        <!-- 展开列 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 文本输入框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 添加新标签</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed">
        <!-- 添加参数表单 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <template #footer>
            <span class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </template>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%" @close="editDialogClosed">
        <!-- 添加参数表单 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <template #footer>
            <span class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </template>
        </el-dialog>
    </div>
</template>
<script>
export default{
    data(){
        return{
            cateList:[],
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',
                expandTrigger:'hover'
            },
            // 级联选择器双向绑定到的数组
            selectedCateKeys:[],
            //当前所处的页签位置
            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            //静态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数表单数据对象
            addForm:{},
            attr_name:'',
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[{required:true, message:'请输入参数名称',trigger:'blur'}]
            },
            //控制修改参数对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            //修改表单的验证规则
            editFormRules:{
                attr_name:[{required:true, message:'请输入参数名称',trigger:'blur'}]
            },
            //控制按钮和文本框的切换和显示
            inputVisible:false,
            // 文本框中输入的内容
            inputValue:''
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有商品分类数据
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类数据失败')
            }
            this.cateList=res.data
        },
        //级联选择框变化会触发这个函数
        handleChange(){
           this.getParamsData()
        },
        //tab 页签点击事件的处理函数
        handleClick(){
           this.getParamsData()
        },
        //获取参数的列表数据
        async getParamsData(){
             // 证明选中的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            //根据所选分类的Id和当前所处的面板，获取对应的参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败')
            }
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
                //控制文本框的显示与隐藏
                item.inputVisible=false
                //文本框输入的值
                item.inputValue=''
            })
            // console.log(res.data)
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        //监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加分类数据失败')
                }
                this.$message.success('添加分类数据成功')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击按钮展示修改对话框
        async showEditDialog(attr_id){
            //查询当前参数的信息
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{attr_sel:this.activeName}
            })
            if(res.meta.status!==200){
                return this.$message.error('获取当前参数信息失败')
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },
        //监听修改对话框的关闭事件 
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==200){
                    return this.$message.error('修改参数信息失败')
                }
                this.$message.success('修改参数信息成功')
                this.getParamsData()
                this.editDialogVisible=false
            })
        },
        // 点击按钮删除参数信息
        async removeParams(attr_id){
            const confirmResult=await this.$confirm('此操作将永久删除该数据, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err=>err)
            if(confirmResult!=='confirm'){
                return this.$message.info('已经取消删除')
            }
            const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status!==200){
                return this.$message.error('删除数据失败')
            }
            this.$message.success('删除数据成功')
            this.getParamsData()
        },
        //文本框失去焦点或者按下Enter键都会触发
        async handleInputConfirm(row){
            //trim()：去除空格字符
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            //如果没有return，则证明输入的内容需要做后续的处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            // 需要发起请求保存此次操作
            this.saveAttrVals(row)
        },
        //点击按钮展示文本输入框
        showInput(row){
           row.inputVisible=true 
           //让文本框自动获取焦点
           //$nextTick方法的作用，当页面上的元素被重新渲染之后，才会调用回调函数里的代码
           this.$nextTick(() => {
                this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        // 将对attr_vals的操作保存到数据库
        async saveAttrVals(row){
            // 发起请求，保存此次操作
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status!==200){
                return this.$message.error('修改参数失败')
            }
            this.$message.success('修改参数成功')
        },
        //删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed:{
        //如果按钮需要被禁用则返回true,反之返回false
        isBtnDisable(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        // 当前选中的三级分类id
        cateId(){
            if(this.selectedCateKeys.length==3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算对话框标题名称
        titleText(){
            if(this.activeName=='many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>
<style lang="less" scoped>
.option{
    margin:15px 0;
}
.el-tag{
    margin:10px;
}
.input-new-tag{
    width: 120px;
}
</style>
